Are Fox News execs about to hand over the scalp of their ratings king to the smear group Media Matters? (UPDATE: Yes.)

On Wednesday, talk radio host Glenn Beck tweeted an email from the Bonner Group, a leftist fundraising firm that works for Media Matters.

The April 13 email is an invitation to join a briefing call on Media Matters’ campaign against the network’s biggest star.“Thanks to Media Matters, O’Reilly and Fox News are being held accountable,” the email reads.

“We are currently at a critical juncture in this campaign I hope you can join Media Matters President Angelo Carusone to hear about the success of the campaign so far, and our plans moving forward,” Mary Pat Bonner writes.

She then offers a way for readers to sign up for an “update” call.The email may be the “irrefutable” evidence O’Reilly’s attorney said proves the whole this is a set up.

“Bill O’Reilly has been subjected to a brutal campaign of character assassination that is unprecedented in post-McCarthyist America. This law firm has uncovered evidence that the smear campaign is being orchestrated by far-left organization bent on destroying O’Reilly for political and financial reasons,” Marc Kasowitz said in a statement, according to Mediaite.